BBC journalists took photographs of Marks & Spencer labels in the factories.

Some Syrian refugees worked 12-hour days in a factory distressing jeans for fashion brands Mango and Zara, using chemicals with inadequate protection, the BBC said.

An M&S spokesperson said: “We had previously found no evidence of Syrian workers employed in factories that supply us, so we were very disappointed by these findings, which are extremely serious and are unacceptable to M&S.”

An ASOS spokesperson said: “It’s a subject we take incredibly seriously. But it would be wrong for us to comment on reporting we haven’t seen.”

M&S said it was working with the Turkish supplier to offer permanent legal employment to any Syrian daily workers employed in the factory.

Turkey has been a main entry point for refugees from the ongoing conflict in Syria, with three million estimated to be living there. Ankara in March signed a deal with the EU to stem the flow of refugees into the bloc.

A Reuters investigation this year also found evidence of Syrian refugee children in Turkey working in clothes factories in illegal conditions.

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